Timing device for fuel injection pump



March 13, 1962 H. HOGEMAN 3,024,779

TIMING DEVICE FOR FUEL INJECTION PUMP Filed oct. so, 1958 4 Sheets-Sheet1 PIPE. FROM SUPPLY PUMP 0 SUM 1 Sir rum 2 HANS HOGEMAN A TTOENEX March13, 1962 H. HOGEMAN TIMING DEVICE FOR FUEL INJECTION PUMP Filed Oct. 50,1958 l I a l I011 as E IO 4 Sheets-Sheet 2 INVENTOR.

HANS HOGEMAN AT TOPNEY March 13, 1962 H. HOGEMAN 3,024,779

TIMING DEVICE FOR FUEL INJECTION PUMP Filed Oct. 30, 1958 4 Sheets-Sheet3 Fjg. 5'. I\ EXTERNAL \i HELICAL smmes INTERNAL 66 as O 4: O

I Q |"'|'w' I 63 6 o 47 o INVENTOR. HA N6 H OGELMAN March 13, 1962 H.HOGEMAN 3,024,779

TIMING DEVICE oR FUEL INJECTION PUMP Filed 0ct. 30, 1958 4 SheetsSheet 4EXTERNAL. SPLJ N ES INTERNAL SPLINEZS ON CAM I5 EXTERNAL SPLINES ONSHAFT u INVENTOR. HANS HOGE MAN lax 24%;

D l Ja r d assure!" York Filed Get. 30, 1958, Ser. No. 770,768 14Claims. (Cl. 123-139) This invention relates to fuel injection apparatusfor internal combustion engines and has particular reference to a newand improved form of fuel injection pump in which the timing ofinjection by the pump may be varied.

An object of the invention is to provide a new and improved fuelinjection pump having variable timing means whereby the timing of theinjection by the pump may be varied.

Another object is to provide an apparatus of the type set forth whereinthe means for varying the timing of in- Jection is embodied in the pumpand does not require any external timing device.

Another object is to provide a new and improved device of the type setforth which is relatively compact and simple in construction andassembly, yet elficient in operation.

Referring to the drawings:

FIG. 1 is a longitudinal sectional view of a fuel injection apparatusembodying the invention;

FIG. 2 is a sectional view taken on line 2-2 of FIG. 1, looking in thedirection of the arrows;

FIG. 3 is a sectional view taken on line 33 of FIG. 1, looking in thedirection of the arrows;

FIG. 4 is a plan view of the sleeve having internal and externalsplines; and

FIG. 5 is a fragmentary sectional view further showing the cam shaft andcam arrangement of FIG. 1.

Referring more particularly to the drawings wherein similar referencecharacters designate corresponding parts throughout, the apparatus shownembodying the invention comprises a housing or casing in which the driveshaft or cam shaft designated generally at 11 is journalled in thebearings 12 and 13 and which drive shaft is adapted to be operativelyconnected to the engine and to be driven thereby.

On the end of drive shaft 11 is mounted a spur gear 14.

The drive shaft 11 is provided with a cam 15 having the lobes 15a, thenumber of which depends upon the speed at which the pump is to bedriven, for example, when the drive shaft 11 is connected to afour-cycle engine and adapted to operate at one half engine speed, thenumber of lobes 15a on the cam is equal to the number of pump outletsand where the drive shaft 11 is adapted to be driven at engine speed,the cam is provided with one half the number of lobes 15a as the pumphas outlets.

In the portion 10a of the casing or housing 19 above drive shaft 11 isprovided the pump head 16 which fits into a recess 17 in said portion10a of housing 10.

The pump head 16 has the bore 18 therethrougb, the outer end of which isclosed by a threaded plug or the like 19 and the pump head 16 isprovided with the outlets 20, one of which is provided for each cylinderor combustion chamber of the engine and which outlets 20 are connectedto the bore 18 by ducts or passages 21.

The pump head or hydraulic head 16 is retained in position in casing 10aby means of the flange member 22 which is secured to casing 10a by boltsor other suitable means.

The pump head 16 is provided with a peripheral recess or groove 23adjacent the periphery of the pump head and which, together with theadjacent wall 10a of the housing, forms a sump to which fuel is suppliedthrough a pipe 26a which is adapted to be connected to a suitt'atesatent able source of fuel such as to fuel supply pump 26, which may beof the impeller type gear or vane type, as desired, or if desired, anexternal fuel supply pump could be employed.

Fuel is supplied to the bore 13 from sump 23 by means of fill ports orducts 27 which may be of suitable number, such as one port for eachengine cylinder or any multiple thereof. From ports 27 fuel passesthrough radial fill ports 35 and thence through an axial passage 30 inmember 29 to pumping chamber 18a.

Intermediate the ends of bore 18 there is also provided the spill sump28.

The plunger or pumping and distributing member 29 is positioned in bore18 in the pump head in and said member 29 is provided with an axial bore30 in the end thereof adjacent plug 19 and, at its opposite end, member29 is adapted to engage tappet 31 and to be held in engagement therewithby spring 32 which engages spring seat 33, which spring seat engages thehead on the member 29 and retains it in engagement with tappet 31.Tappet roller 34 is provided between cam 15 and tappet 31.

Cam lobes 15a urge member 29 upward on its pumping and distributingstroke and spring 32 effects the return stroke of said member 29.

Member 29 is provided with radial fill ports 35, one of which isprovided for each fill port 27 for supplying fuel from said ducts 27through passage 30 to the pumping chamber 18a between the end of member27 and plug 19 through bore 30 in the member 29, whereby bore 30 will bein communication with fill ports 27 during suction stroke of member 29because of the relationship of ports 35 to ports 27 during the fillingstroke. Adjacent to ports 35, member 29 is provided with a peripheralgroove adapted to supply fuel under injection pressure to port 42 ashereinafter described.

Fill ports 27 are so positioned that during the injection stroke of themember 29, said ports 27 do not communicate with ports 35. During theearly part of the injection stroke, groove 36 is in communication withfill ports 27 and permits a spill back of fuel, thereby preventing thebeginning of the injection until the movement of the plunger 29 issufiicient to cause groove 36 to pass out of communication with ports27. Groove 36 communicates with passage 30 through passage or port 36awhich acts as a fill port during the latter part of the filling strokeand as the delivery port during the injection stroke.

For controlling the quantity of fuel injected by the pump, a spillpassage 37 is provided which communicates with bore 30 in the member 29and spill passage 37 is adapted to spill fuel to spill sump 28 throughradial ports 39a, and sleeve 39 is adjustable to control or vary theamount of spill through said spill ports 39a to thereby control thequantity of fuel injected by the pump.

Fuel pumped by the member 29 in bore 18 passes through duct or passage3% through port 36a to port 42, through delivery valve 41 and port 46 toannulus 43 to distributing groove 43a on the periphery of member 29,which distributing groove 43 is adapted to communicate with each outletpassage 21 successively upon rotation of member 29 to thereby distributefuel to each of the outlets 20 in succession.

In order that the member 29 may be rotated to align distributing port 43with each of the outlet ducts 21, a face gear 44 is provided adjacentthe lower end of member 29 and surrounding said member and said facegear 44 is connected to member 29 by means of pin 45 or other suitablemeans for operatively connecting face gear 44 with member 29.

Face gear 44 is adapted to be rotated upon rotation of drive shaft 11and spur gear 14 through the pinion 45a which is interposed betweengears 14 and 44 and in U those constructions embodying a governor, asshown in FIG. 1, the pinion 45 may be mounted on the governor shaft 46for simultaneously driving the governor shaft and operating the fuelsupply pump 26, as shown in the construction of FIG. 1.

The governor arrangement shown is a centrifugal type governor adapted tobe actuated through the centrifugal force of governor weights 47 whichare adapted to actuate governor sleeve 48 along governor shaft 46 and,as said governor sleeve 48 is mechanically connected to spill sleeve 39through linkage 49, shaft 50 and eccentric 51, movement of sleeve 48 byweights 47 will effect movement or adjustment of sleeve 39.

The governor weights 47 are pivotally mounted on spider 47a and, as willbe seen from FIG.4, three such weights are preferably provided andspider 47a is connected to governor shaft 46 by being keyed thereto asthrough the flat engaging edges 47b.

The timing of injection by the pump may be varied by varying therelationship of lobes 15a of cam 15 and drive shaft 11.

Drive shaft or cam shaft 11 is provided with an axial bore 52 and adiametrical slot or opening 53 passing through said bore 52 and in saidslot or opening 53 is positioned a pin or member 54 which is connectedat its opposite ends to timing sleeve 64 as shown in FIG. 2. Slots 53aare provided in drive shaft 11 to allow movement of pin 54.

Cam 15 has the sleeve and reduced extension portion 15b positionedbetween the journal 13 and the reduced end of drive shaft 11 and is alsoprovided with a bore 150 aligned with bore 52.

In bore 156 is positioned a plunger member 55 which is connected to pin54. Coil spring 56a on the opposite side of pin 54 from plunger 55engages said pin 54 and thereby the opposite end of plunger 55 isretained in engagement With cam 56 on control lever shaft 62 which isheld in operative position by spring 63.

Plunger 55 is provided with a slot 55a through which extends pin 5515which limits the movement of said plunger 55.

Between cam 15 and drive shaft 11 is provided the timing sleeve 64having external and internal helical grooves adapted to mesh with saidexternal and internal splines on drive shaft 11 and cam 15,respectively.

FIG. is a sectional view taken on a line normal to the section of FIG. 1and shows more clearly the cam shaft and cam arrangement.

FIG. 6 is a fragmentary perspective view, partly in section, showing theconnection between the cam shaft and cam.

It will be seen that any change in the position of the operating leverand shaft 62 will simultaneously effect adjustment of plunger member 55which adjusts sleeve 64 to thereby change the phase relationship betweendrive shaft 11 and cam and thereby change the phase relationship betweenthe cam lobes 15a and the drive shaft 11 to vary the timingof injectionby the pump.

The idle control is provided by spring 65 which is connected to idleadjusting screw 66 which is adapted to adjust the position of spring 65relative to governor lever 67.

Full load adjusting screw 68 is provided for controlling the desiredfull load fuel quantity and is provided with torque control screw 69which is resiliently urged into full load position by spring 70, whichallows torque control screw 69 to move slightly beyond full loadposition for providing the desired torque backup. The screw 68 isscrewed into place to retain the unit in full load fuel position andthen the torque control screw 69 is adjusted to desired position.

In the operation of the device, when the control lever shaft 62 isadjusted to vary the fuel quantity, the cam 56 is simultaneouslyadjusted to vary the injection timing. As will be seen from the drawing,pivoting of the shaft 62 will cause cam 56 to move plunger 55 againstthe force of spring 56 or allow said plunger 55 to be moved by spring 56and through the helical grooves of sleeves 64 and splines on drive shaft11 and cam 15 adjust the relative position or phasing of cam lobes 15aand drive shaft 11.

It will be seen that with the cam 15 and cam lobes 15a integral withsleeve 15!), which is journalled in hearing 13, that a simplified,rugged and compact construction will result whereby the timing ofinjection may be adjusted without disturbing the phase relationshipbetween the cam 15 and plunger 29.

From the foregoing it will be seen that I have provided new and improvedmeans for obtaining all of the objects and advantages of the invention.

I claim:

1. In a device of the character described, a drive shaft and a cam shafthaving adjacent portions in telescoping relation, a pumping anddistributing member adjacent said cam shaft and adapted to bereciprocated thereby, cam means on said cam shaft for effecting suchreciprocation of said pumping and distributing member, gear meanscarried by said cam shaft for effecting rotation of said pumping anddistributing member, means between the adjacent portions of said driveshaft and cam shaft for altering the phase relation between said driveshaft and cam means to change the phasing between said drive shaft andplunger Without disturbing the relation of said gear means and pumpingand distributing member, a pin mounted for sliding movement in saiddrive shaft and having its opposite ends connected to said means betweensaid cam shaft and drive shaft, resilient means in said drive shaft forurging said pin in one direction and a rod extending through alignedbores in said cam shaft and drive shaft and operatively connected tosaid pin for adjusting said pin against the force of said resilientmeans and means for limiting the movement of said rod.

2. In a device of the character described, a drive shaft and a cam shafthaving adjacent portions in telescoping relation, a pumping anddistributing member adjacent said cam shaft and adapted to bereciprocated thereby, cam means on said cam shaft for effecting suchreciprocation of said pumping and distributing member, gear meanscarried by said cam shaft for effecting rotation of said pumping anddistributing member, means between the adjacent portions of said driveshaft and cam shaft for altering the phase relation between said driveshaft and cam means to change the phasing between said drive shaft andplunger without disturbing the relation of said gear means and pumpingand distributing member, a pin mounted for sliding movement in saiddrive shaft and having its opposite ends connected to said means betweensaid cam shaft and drive shaft, resilient means in said drive shaft forurging said pin in one direction and a rod extending through alignedbores in said cam shaft and drive shaft and operatively connected tosaid pin for adjusting said pin against the force of said resilientmeans and means for limiting the movement of said rod, said means forlimiting the movement of said rod comprising a slot in said rod and apin extending through said slot and having its ends connected to saidcam shaft.

3. In a device of the character described, a drive shaft and a cam shafthaving adjacent portions in telescoping relation, a pumping anddistributing member adjacent said cam shaft and adapted to bereciprocated thereby, cam means on said cam shaft for effecting suchreciprocation of said pumping and distributing member, gear meanscarried by said cam shaft for effecting rotation of said pumping anddistributing member, means between the adjacent portions of said driveshaft and cam shaft for altering the phase relation between said driveshaft and cam means to change the phasing between said drive shaft andplunger without disturbing the relation of said gear means and pumpingand distributing member, a pin mounted for sliding movement in saiddrive shaft and having its opposite ends connected to said means betweensaid cam shaft and drive shaft, resilient means in said drive shaft forurging said pin in one direction and a rod extending through alignedbores in said cam shaft and drive shaft and operatively connected tosaid pin for adjusting said pin against the force of said resilientmeans and means for limiting the movement of said rod, and cam means foreffecting movement of said rod.

4. In a device of the character described, a drive shaft and a cam shafthaving adjacent portions in telescoping relation, a pumping anddistributing member adjacent said cam shaft and adapted to bereciprocated thereby, cam means on said cam shaft for effecting suchreciprocation of said pumping and distributing member, carried by saidcarn shaft for effecting rotation of said pumping and distributingmember, means between the adjacent portions of said drive shaft and camshaft for altering the phase relation between said drive shaft and cammeans to change the phasing between said drive shaft and plunger Withoutdisturbing the relation of said gear means and pumping and distributingmember, a pin mounted for slid ing movement in said drive shaft andhaving its opposite ends connected to said means between said cam shaftand drive shaft, resilient means in said drive shaft for urging said pinin one direction and a rod extending through aligned bores in said camshaft and drive shaft and operatively connected to said pin foradjusting said pin against the force of said resilient means and meansfor limiting the movement of said rod, a pump operating lever, and cammeans for effecting movement of said rod, said cam means beingoperatively connected to said pump operating lever and adapted to beadjusted simultaneously therewith.

5. In a device of the character described, a drive shaft and a cam shafthaving adjacent portions in telescoping relation, a pumping anddistributing member adjacent said cam shaft and adapted to bereciprocated thereby, earn means on said cam shaft for effecting suchreciprocation of said pumping and distributing member, gear meanscarried by said cam shaft for effecting rotation of said pumping anddistributing member, means between the adjacent portions of said driveshaft and cam shaft for altering the phase relation between said driveshaft and cam means to change the phasing between said drive shaft andplunger without disturbing the relation of said gear means and pumpingand distributing member, a pin mounted for sliding movement in saiddrive shaft and having its opposite ends connected to said means betweensaid cam shaft and drive shaft, resilient means in said drive shaft forurging said pin in one direction and a rod extending through alignedbores in said cam shaft and drive shaft and operatively connected tosaid pin for adjusting said pin against the force of said resilientmeans and means for limiting the movement of said rod, said meansbetween said drive shaft and cam shaft comprising a helical spline.

6. In a device of the character described. a drive shaft and a cam shafthaving adjacent portions in telescoping relation, a pumping anddistributing member adjacent said cam shaft and adapted to bereciprocated thereby, cam means on said cam shaft for effecting suchreciprocation of said pumping and distributing member, gear meanscarried by said cam shaft for effecting rotation of said pumping anddistributing member, means between the adjacent portions of said driveshaft and cam shaft for altering the phase relation between said driveshaft and cam means to change the phasing between said drive shaft andplunger Without disturbing the relation of said gear means and pumpingand distributing member, a pin mounted for sliding movement in saiddrive shaft and having its opposite ends connected to said means betweensaid cam shaft and drive shaft, resilient means in said drive shaft forurging said pin in one direction and a rod extending through alignedbores in said cam shaft and drive shaft and operatively connected tosaid pin for adjusting said pin against the force of said resilientmeans and means for limiting the movement of said rod, said meansbetween said drive shaft and cam shaft comprising a helical spline, andcam means for effecting movement of said rod.

7. In a device of the character described, a drive shaft and a cam shafthaving adjacent portions in telescoping relation, a pumping anddistributing member adjacent said cam shaft and adapted to bereciprooated thereby, cam means on said cam shaft for effecting suchreciprocation of said pumping and distributing member, gear meanscarried by said cam shaft for effecting rotation of said pumping anddistributing member, means between the adjacent portions of said driveshaft and cam shaft for altering the phase relation between said driveshaft and cam means to change the phasing between said drive shaft andplunger without disturbing the relation of said gear means and pumpingand distributing member, a pin mounted for sliding movement in saiddrive shaft and having its opposite ends connected to said means betweensaid cam shaft and drive shaft, resilient means in said drive shaft forurging said pin in one direction and a rod extending through alignedbores in said cam shaft and drive shaft and operatively connected tosaid pin for adjusting said pin against the force of said resilientmeans and means for limiting the movement of said rod, a pump operatinglever, said means between said drive shaft and cam shaft comprising ahelical spline, and cam means for effecting movement of said rod, saidcam means being operatively connected to said pump operating lever andadapted to be adjusted simultaneously therewith.

8. In a device of the character described, a drive shaft, a cam shaft,said drive shaft and cam shaft having their adjacent ends in telescopingrelation, a pumping and distributing member, said cam shaft having cammeans for effecting reciprocation of said pumping and distributingmeans, gear means carried by said cam shaft for effecting rotation ofsaid pumping and distributing member and means for changing the phaserelation between said drive shaft and pumping and distributing memberwithout disturbing the phase relation between said gear means and saidpumping and distributing member.

9. In a device of the character described, a drive shaft, a cam shaft,said drive shaft and cam shaft having their adjacent ends in telescopingrelation, a pumping and distributing membensaid cam shaft having cammeans for effecting reciprocation of said pumping and distributingmeans, gear means carried by said cam shaft for effecting rotation ofsaid pumping and distributing member and means for changing the phaserelation between said drive shaft and pumping and distributing memberwithout disturbing the phase relation between said gear means and saidpumping and distributing member, said means comprising means between theadjacent portions of said drive shaft and cam shaft and means foradjusting said means.

10. In a device of the character described, a drive shaft, a cam shaft,said drive shaft and cam shaft having their adjacent ends in telescopingrelation, a pumping and distributing member, said cam shaft having cammeans for effecting reciprocation of said pumping and distributingmeans, gear means carried by said cam shaft for effecting rotation ofsaid pumping and distributing member and means for changing the phaserelation between said drive shaft and pumping and distributing memberwithout disturbing the phase relation between said gear means and saidpumping and distributing member, said means comprising means between theadjacent portions of said drive shaft and cam shaft and means foradjusting said means, a pump operating lever, said adjusting meanscomprising a lever actuated by said pump operating lever and operativelyconnected to said means between said drive shaft and cam shaft.

11. In a device of the character described, a drive shaft, a cam shaft,said drive shaft and cam shaft having their adjacent ends in telescopingrelation, a pumping and distributing member, said cam shaft having cammeans for effecting reciprocation of said pumping and distributingmeans, gear means carried by said cam shaft for effecting rotation ofsaid pumping and distributing member and means for changing the phaserelation between said drive shaft and pumping and distributing memberwithout disturbing the phase relation between said gear means and saidpumping and distributing member, said means comprising a helical splinebetween the adjacent portions of said drive shaft and cam shaft andmeans for adjusting said spline to vary the phase relation of said driveshaft and cam shaft.

12. In a device of the character described, a drive shaft, a cam shaft,said drive shaft and cam shaft having their adjacent ends in telescopingrelation, a pumping and distributing member, said cam shaft having cammeans for effecting reciprocation of said pumping and distributingmeans, gear means carried by said cam shaft for effecting rotation ofsaid pumping and distributing member and means for changing the phaserelation between said drive shaft and pumping and distributing memberwithout disturbing the phase relation between said gear means and saidpumping and distributing member, said means comprising a helical splinebetween the adjacent portions of said drive shaft and cam shaft andmeans for adjusting said spline to vary the phase relation of said driveshaft and cam shaft, an operating lever, and means operatively connectedto said Spline and actuated by said operating lever for adjusting saidspline to vary the phase relation between said drive shaft and camshaft.

13. In a device of the character described, a drive shaft, a cam shaft,said drive shaft and cam shaft having their adjacent ends in telescopingrelation, a pumping and dis- 55 tributing member, said cam shaft havingcam means for effecting reciprocation of said pumping and distributingmeans, gear means carried by said cam shaft for effecting rotation ofsaid pumping and distributing member and means for changing the phaserelation between said drive shaft and pumping and distributing memberwithout disturbing the phase relation between said gear means and saidpumping and distributing member, said cam shaft having a portionjournalled in a bearing intermediate said cam portion and said gearmeans.

14. In a device of the character described, a drive shaft, a cam shaft,said drive shaft and cam shaft having their adjacent ends in telescopingrelation, a pumping and distributing member, said cam shaft having cammeans for effecting reciprocation of said pumping and distributingmeans, gear means carried by said cam shaft for effecting rotation ofsaid pumping and distributing member and means for changing the phaserelation between said drive shaft and pumping and distributing memberwithout disturbing the phase relation between said gear means and saidpumping and distributing member, said means comprising a helical splinebetween the adjacent portions of said drive shaft and cam shaft andmeans for adjusting said spline to vary the phase relation of said driveshaft and cam shaft, a pin extending through a slot in said drive shaftand connected adjacent its opposite ends to said spline, a plungerpositioned in a bore in said drive shaft for urging said pin and splinein one direction, a pump operating shaft, resilient means for urgingsaid pin against said plunger and cam means intermediate said plungerand said pump operating shaft for actuating said plunger and spline uponadjustment of said pump operating shaft.

No references cited.

